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Common Lisp implementation running on the JVM
;;; signal.lisp
;;;
;;; Copyright (C) 2003-2007 Peter Graves
;;; $Id$
;;;
;;; This program is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License
;;; as published by the Free Software Foundation; either version 2
;;; of the License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program; if not, write to the Free Software
;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
;;;
;;; As a special exception, the copyright holders of this library give you
;;; permission to link this library with independent modules to produce an
;;; executable, regardless of the license terms of these independent
;;; modules, and to copy and distribute the resulting executable under
;;; terms of your choice, provided that you also meet, for each linked
;;; independent module, the terms and conditions of the license of that
;;; module. An independent module is a module which is not derived from
;;; or based on this library. If you modify this library, you may extend
;;; this exception to your version of the library, but you are not
;;; obligated to do so. If you do not wish to do so, delete this
;;; exception statement from your version.
;;; Adapted from SBCL.
(in-package "SYSTEM")
(export 'coerce-to-condition)
(defvar *maximum-error-depth* 10)
(defvar *current-error-depth* 0)
(defvar *handler-clusters* nil)
(defvar *break-on-signals* nil)
(defun signal (datum &rest arguments)
(let ((condition (coerce-to-condition datum arguments 'simple-condition 'signal))
(*handler-clusters* *handler-clusters*))
(let* ((old-bos *break-on-signals*)
(*break-on-signals* nil))
(when (typep condition old-bos)
(let ((*saved-backtrace* (sys:backtrace)))
(break "~A~%BREAK called because of *BREAK-ON-SIGNALS* (now rebound to NIL)."
condition))))
(loop
(unless *handler-clusters*
(return))
(let ((cluster (pop *handler-clusters*)))
(dolist (handler cluster)
(when (typep condition (car handler))
(funcall (cdr handler) condition)))))
nil))
(defun error (datum &rest arguments)
(let ((condition (coerce-to-condition datum arguments 'simple-error 'error)))
(signal condition)
(let ((*current-error-depth* (1+ *current-error-depth*)))
(cond ((> *current-error-depth* *maximum-error-depth*)
(%format *debug-io*
"~%Maximum error depth exceeded (~D nested errors) with '~A'.~%"
*current-error-depth* condition)
(if (fboundp 'internal-debug)
(internal-debug)
(quit :status 89))) ;; it's a prime and a fibonacci!
(t
(invoke-debugger condition))))))
;; COERCE-TO-CONDITION is redefined in clos.lisp.
(defun coerce-to-condition (datum arguments default-type fun-name)
(cond ((typep datum 'condition)
(when arguments
(error 'simple-type-error
:datum arguments
:expected-type 'null
:format-control "You may not supply additional arguments when giving ~S to ~S."
:format-arguments (list datum fun-name)))
datum)
((symbolp datum)
(%make-condition datum arguments))
((or (stringp datum) (functionp datum))
(%make-condition default-type
(list :format-control datum
:format-arguments arguments)))
(t
(error 'simple-type-error
:datum datum
:expected-type '(or symbol string)
:format-control "Bad argument to ~S: ~S."
:format-arguments (list fun-name datum)))))
(defmacro handler-bind (bindings &body forms)
(dolist (binding bindings)
(unless (and (consp binding) (= (length binding) 2))
(error "ill-formed handler binding ~S" binding)))
`(let ((*handler-clusters*
(cons (list ,@(mapcar (lambda (x) `(cons ',(car x) ,(cadr x)))
bindings))
*handler-clusters*)))
(java:jrun-exception-protected
(lambda ()
(progn
,@forms)))))
(defmacro handler-case (form &rest cases)
(let ((no-error-clause (assoc ':no-error cases)))
(if no-error-clause
(let ((normal-return (make-symbol "normal-return"))
(error-return (make-symbol "error-return")))
`(block ,error-return
(multiple-value-call (lambda ,@(cdr no-error-clause))
(block ,normal-return
(return-from ,error-return
(handler-case (return-from ,normal-return ,form)
,@(remove no-error-clause cases)))))))
(let ((tag (gensym))
(var (gensym))
(annotated-cases (mapcar (lambda (case) (cons (gensym) case))
cases)))
`(block ,tag
(let ((,var nil))
(declare (ignorable ,var))
(tagbody
(handler-bind
,(mapcar (lambda (annotated-case)
(list (cadr annotated-case)
`(lambda (temp)
,(if (caddr annotated-case)
`(setq ,var temp)
'(declare (ignore temp)))
(go ,(car annotated-case)))))
annotated-cases)
(return-from ,tag
,form))
,@(mapcan
(lambda (annotated-case)
(list (car annotated-case)
(let ((body (cdddr annotated-case)))
`(return-from
,tag
,(cond ((caddr annotated-case)
`(let ((,(caaddr annotated-case)
,var))
,@body))
(t
`(locally ,@body)))))))
annotated-cases))))))))